AU2011208902A1

AU2011208902A1 - Flotation reagent for iron ores containing magnetite and/or haematite

Info

Publication number: AU2011208902A1
Application number: AU2011208902A
Authority: AU
Inventors: Uwe Dahlmann; Klaus-Ulrich Pedain
Original assignee: Clariant Finance BVI Ltd
Current assignee: Clariant International Ltd
Priority date: 2010-01-19
Filing date: 2011-01-04
Publication date: 2012-05-03
Anticipated expiration: 2031-01-04
Also published as: CN102770213B; EP2525915A1; ZA201202694B; US20120325725A1; UA106784C2; ES2542746T3; WO2011088963A1; DK2525915T3; EP2525915B1; DE102010004893A1; AU2011208902B2; CL2012002001A1; RU2562284C2; CA2787445C; BR112012017237B1; US8939291B2; RU2012135550A; CA2787445A1; CN102770213A; BR112012017237A2

Abstract

The present invention relates to a flotation reagent for iron ores containing magnetite and/or haematite and to the use of a composition containing A) at least one amine alkoxylate ester of formula (I) or a salt thereof, wherein A and B, independently of one another, represent a C-C alkylene radical, R is a C to C alkyl or alkenyl radical, R, R and R, independently of one another, are H or a C to C acyl radical, with the proviso that at least one of the radicals R, R or R stands for a Cto C acyl radical, x, y and z, independently of one other, are an integer of from 0 to 50, with the proviso that x + y + z is an integer of from 1 to 100, and B) a compound of formula D-NH, in which D stands for a hydrocarbon radical having from 1 to 50 carbon atoms, which can contain either an oxygen atom or an oxygen atom and a nitrogen atom, in amounts of 10 to 5.000 g/tonne as a collector in the reverse flotation of iron ore containing magnetite, haematite or both.

Description

WO 2011/088963 PCT/EP2011/000007 Description Flotation reagent for iron ores containing magnetite and/or haematite 5 The present invention relates to the use of collectors in the beneficiation by flotation of iron ore that contains magnetite and/or hematite. Many naturally occurring ores and minerals contain silicate as an unwanted 10 accompanying mineral. In addition to iron ore, these include calcite, phosphate ore and feldspar. In particular in the case of iron ore, the silicate content reduces the quality of the iron ore and interferes in the production of iron. In order to obtain high-quality iron ore, it is of interest to lower the silicate content of the iron ore to below 2%. Usually, the iron ore is 15 separated from the silicate not only by magnetic separation, but also by reverse flotation. For this purpose, the ground iron ore is combined in a flotation cell with water and flotation reagents, wherein the silicate is discharged together with the froth by the use of a collector, while the iron ore remains behind in what is termed the pulp. 20 Silicate collectors which are used are, for example, fatty amines, alkyl ether amines and alkyl ether diamines. These are known under the trade name Flotigam@. 25 Alkyl ether amines and alkyl ether diamines are chiefly used in their partially neutralized forms as partial acetates, as described in US4 319 987. The reason therefor is the better solubility thereof in the pulp. US-6 076 682 describes the combined use of alkyl ether monoamine with 30 alkyl ether diamine for silicate flotation from iron ore. In WO 00/62937, the use of quaternary amines for flotation of iron ore is disclosed. 35 In WO-93/06935, the synergistic action of ether amines and anionic collectors for iron ore flotation is described. Silicate flotation, inter alia from iron ore, using alkyloxyalkanamines is WO 2011/088963 PCT/EP2011/000007 2 described in US-5 540 337. DE-A-10 2006 010 939 discloses the use of a compound of the formula (I) 5

R'-O-R

2

-NH(

2 -m)-[(R 3 )n-H]m (I) where R' is a hydrocarbon group having 1-40 carbon atoms, R 2 is an aliphatic hydrocarbon group having 2-4 carbon atoms, and R 3 is an alkoxy group, n is a number between 1 and 50, and m is 1 or 2, as flotation reagent in silicate flotation. 10 The collectors known in the prior art for iron ore flotation have inadequate selectivity and yield, in particular when iron ores which contain magnetite and/or hematite are to be separated from silicates as accompanying mineral. 15 It was therefore the object of the present invention to find an improved collector for reverse iron ore flotation which floats silicates more selectively. The present invention therefore relates to the use of a composition 20 comprising A) at least one amine alkoxylate ester of the formula (1) or a salt thereof ( A--O R4

R

1 - N B N-A-O R2 (1)

--

O R3 25 where A, B independently of one another are a C 2 to C 5 alkylene radical R1 is a C 8 to C24 alkyl or alkenyl radical

R

2 , R 3 , R 4 independently of one another are H or a C 8 to C 24 acyl 30 radical, with the proviso that at least one of the radicals R 2 , R 3 or R 4 is a C 8 to C 24 acyl radical WO 2011/088963 PCT/EP2011/000007 3 x, y, z independently of one another are an integer from 0 to 50, with the proviso that x + y + z is an integer from 1 to 100, and 5 B) a compound of the formula D-NH 2 , where D is a hydrocarbon radical having 1 to 50 carbon atoms and which can contain either an oxygen atom or an oxygen atom and a nitrogen atom, 10 in amounts of 10 to 5000 g/tonne as collector in the reverse flotation of iron ore which contains magnetite, hematite, or both. The invention further relates to a method for the reverse flotation of iron ore that comprises magnetite, hematite or both, by contacting the iron ore with 15 a composition comprising A) at least one amine alkoxylate ester of the formula (I) or a salt thereof ( A-O R4 Ri- N B N(A-OxR2 (1) SA-O R3 y where 20 A, B independently of one another are a C2 to C5 alkylene radical

R

1 is a C8 to C24 alkyl or alkenyl radical

R

2 , R 3 , R 4 independently of one another are H or a C8 to C24 acyl radical, with the proviso that at least one of the radicals R 2 , R 3 or R 4 is a C8 to C24 acyl radical 25 x, y, z independently of one another are an integer from 0 to 50, with the proviso that x + y + z is an integer from 1 to 100, and 30 B) a compound of the formula D-NH 2 , where D is a hydrocarbon radical having 1 to 50 carbon atoms and which can contain either an oxygen atom WO 2011/088963 PCT/EP2011/000007 4 or an oxygen atom and a nitrogen atom, in amounts of 10 to 5000 g/tonne of iron ore. 5 The composition of A) and B) is hereinafter also termed "collector according to the invention". A) and/or B) can be used as described or in the form of salts thereof which are obtainable by reacting A) and/or B) with acids, for example acetic acid 10 or hydrochloric acid. The ratio of the collector components A:B is preferably between 98:2 and 2:98 by weight, in particular between 70:30 and 30:70 by weight. 15 In a particularly preferred embodiment, the collector according to the invention is free from quaternary ammonium compounds that comprise at least one organic radical that is bound to the ammonium nitrogen atom, optionally contains heteroatoms, and has 8 to 36 carbon atoms. A quaternary ammonium compound is taken to mean a compound which 20 does not bear a hydrogen atom on the ammonium nitrogen atom, but in which the ammonium nitrogen atom is bound to four carbon atoms. This particularly preferred embodiment is therefore not taken to mean the embodiment in which either the compound of the formula 1 or the compound B) of the formula D-NH 2 or both are present as mono- or 25 diammonium salts. These mono- or diammonium salts bear at least one hydrogen atom on the ammonium nitrogen atom. Component B) can also be used as salt, for example as acetate. Component B) of the collector according to the invention is preferably one 30 or more of the compounds of the formulae (11) to (IV). These compounds are

R

9

-O-R

5

-NH

2 (II) WO 2011/088963 PCT/EP2011/000007 5 where R 9 is a hydrocarbon group having 1-40, preferably 8-32, carbon atoms and R 5 is an aliphatic hydrocarbon group having 2-4 carbon atoms;

R

6

-O-R

7

-NH-R

8

-NH

2 (111) 5 where R 6 is a hydrocarbon group having 1-40, preferably 8-32, carbon atoms, R 7 and R 8 are an aliphatic hydrocarbon group or different aliphatic hydrocarbon groups having 2-4 carbon atoms;

R

13

-NH

2 (IV) 10 where R 13 is a hydrocarbon group having 1-40, preferably 8-32, carbon atoms. R' is preferably a linear or branched alkyl or alkenyl group which comprises 15 10 to 22 carbon atoms. Particularly preferably, R 1 are isodecyl, isotridecyl, dodecyl, coconut fatty alkyl, or tallow fatty alkyl radicals. R', in a preferred embodiment, is an alkyl and alkenyl chain section which is derived from coconut oil fatty acid, palm oil fatty acid, tallow fatty acid, oleic acid, tall oil fatty acid or rapeseed oil fatty acid. 20

R

2 , R 3 , R 4 independently of one another are acyl radicals having 8 to 24 carbon atoms. The acyl radicals preferably comprise 10 to 18 carbon atoms. They can be linear or branched. The acyl radicals can be saturated or unsaturated. Preferred acyl radicals are stearoyl and oleoyl radicals. 25

R

6 , R 9 , R , independently of one another, are preferably a linear or branched alkyl or alkenyl group which 8 to 18 carbon atoms. Particularly preferably, R 6 , R 9 , R 13 are 2-ethylhexyl, isononyl, isodecyl and isotridecyl and dodecyl radicals. 30

R

5 , R 7 , R 8 , independently of one another, are preferably alkylene groups having 2, 3 or 4 carbon atoms, in particular ethylene or propylene groups.

WO 2011/088963 PCT/EP2011/000007 6 A, in particular, is either an ethylene(-C 2

H

4 -) group, a propylene(-C 3

H

6 -) group or a butylene(-C 4

H

8 -) group. Preferably, A is an ethylene group. B, in particular, is either an ethylene(-C 2

H

4 -) group, a propylene(-C 3

H

6 -) 5 group or a butylene(-C 4

H

8 -) group. Preferably, B is an isopropylene group. The sum of x, y and z preferably gives an integer from 15 to 30, in particular 20 to 25. 10 In a preferred embodiment, the amino alkoxylate ester which makes up the component A) is present in the form of the mono- or diammonium salts thereof which are obtained by neutralization either with organic or mineral acids. 15 The use of the flotation reagent according to the invention can also proceed in combination with frothers and depressants, as are known from the prior art. In order to avoid iron ore being co-discharged in the reverse flotation, preferably hydrophilic polysaccharides, such as, for example, modified starch, carboxymethylcellulose, or gum arabic, are added as depressants 20 in dosages of 10 to 1000 g/t. Silicate flotation is preferably carried out at a pH of 7-12, in particular 8-11, which is adjusted, for example, using sodium hydroxide. 25 Examples The table hereinafter presents the flotation results of the collector according to the invention in comparison with the standard reagent. Flotation experiments were carried out on an iron ore which contained magnetite and 30 hematite.

WO 2011/088963 PCT/EP2011/000007 7 A) Composition of the iron ore Magnetite 59% by weight Hematite 25% by weight 5 (other components) 16% by weight B) Composition of the collectors Collector 1 (comparison) 10 C 10 alkyloxypropylamine acetate of the formula (11), wherein R 9 is a decyl group and R 5 is a propyl group. Collector 2 (comparison) Mixture of dicoconut alkyldimethylammonium chloride and ethoxylated 15 coconut alkylpropylenediamine, esterified with oleic acid (corresponding to formula 1 where A = ethylene, B = propylene, R 1 = coconut fatty alkyl, R 2 ,

R

3 , R 4 = oleoyl, the total of x, y, z is 50) in the weight ratio 1:1. Collector 3 (comparison) 20 C 10 alkyloxydipropylenediamine acetate of the formula (111), wherein R 6 is a decyl group, R 7 and R 8 are a propyl group. Collector 4 (according to the invention) Mixture of 50% by weight of a compound of the formula 1, where A = ethylene B = propylene Ri= coconut fatty alkyl R2 oleoyl R = oleoyl and R = oleoyl 25 the sum of x, y, z is 50, and 50% by weight C 10 alkyloxypropylamine acetate of the formula (II), wherein R 9 is a decyl group and R 5 is a propyl WO 2011/088963 PCT/EP2011/000007 8 group. Collector 5 (comparison) Mixture of 20% by weight dicoconut alkyldimethylammonium chloride, 30% by weight C 10 alkyoxydipropylenediamine of the formula (111), wherein R 6 is 5 a decyl group, R 7 and R 8 are a propyl group and 50% by weight ethoxylated coconut alkylpropylenediamine, esterified with oleic acid (corresponding to formula 1 where A = ethylene, B = propylene, R1 = coconut fatty alkyl, R 2 , R 3 , R 4 = oleoyl, the sum of x, y, z is 50). 10 Table 1: Effectiveness of the collector according to the invention compared with the prior art Example Collector Dosage Yield of Fe Content of Fe [g/t] [%] [%] 1 (C) 1 70 86.5 66.8 2 (C) 1 80 84.6 67.5 3 (C) 1 90 82.1 68 4 (C) 2 70 86.4 67.2 5 (C) 2 80 84.3 67.8 6 (C) 2 90 81.5 68.2 7 (C) 3 70 85.7 67.6 8 (C) 3 80 83.9 68.2 9 (C) 3 90 82.1 68.5 10 4 70 86.8 67.5 11 4 80 84.9 68.3 12 4 90 81.9 68.8 13 (C) 5 70 86.2 67.5 14 (C) 5 80 84.6 68.1 15 (C) 5 90 82.3 68.6 Yield of Fe = m(Fe in the concentrate)/m(Fe in the flotation feed) - 100% WO 2011/088963 PCT/EP2011/000007 9 m(Fe in the concentrate) = content of Fe in the concentrate m(concentrate)/1 00% m(Fe in the flotation feed) = content of Fe in the flotation feed - m(flotation feed)/1 00% 5 The content of Fe in the concentrate was determined by analysis.

Claims

1. The use of a composition comprising 5 A) at least one amine alkoxylate ester of the formula (1) or a salt thereof A--Oz R4 ( )z) R1-N B N A-Ox R2(1 -- OR3 where A, B independently of one another are a C2 to C 5 alkylene radical R1 is a C8 to C24 alkyl or alkenyl radical 10 R

2 , R 3 , R 4 independently of one another are H or a C8 to C24 acyl radical, with the proviso that at least one of the radicals R 2 , R 3 or R 4 is a C8 to C24 acyl radical x, y, z independently of one another are an integer from 0 to 50, with the proviso that x + y + z is an integer from 1 to 100, 15 and B) a compound of the formula D-NH 2 , where D is a hydrocarbon radical having 1 to 50 carbon atoms and which can contain either an oxygen atom 20 or an oxygen atom and a nitrogen atom, in amounts of 10 to 5000 g/tonne as collector in the reverse flotation of iron ore which contains magnetite, hematite, or both. 25 2. The use as claimed in claim 1, wherein R 1 is an alkyl or alkenyl radical having 10 to 22 carbon atoms.

3. The use as claimed in claim 1 and/or 2, wherein R 1 is an isodecyl, isotridecyl, dodecyl or oleyl radical, or is an alkyl and alkenyl chain section 30 which is derived from coconut oil fatty acid, palm oil fatty acid, tallow fatty acid, tall oil fatty acid or rapeseed oil fatty acid. WO 2011/088963 PCT/EP2011/000007 11

4. The use as claimed in one or more of claims 1 to 3, where R 2 , R 3 , R 4 independently of one another are acyl radicals having 10 to 18 carbon atoms.

5 5. The use as claimed in one or more of claims 1 to 4, where R 2 , R 3 , R 4 independently of one another are cocoyl, stearoyl and oleoyl radicals.

6. The use as claimed in one or more of claims 1 to 5, where component B is selected from compounds of the formulae 10 R 9 -O-R 5 -NH 2 (II) where R 9 is a hydrocarbon group having 1-40, preferably 8-32, carbon atoms and R 5 is an aliphatic hydrocarbon group having 2-4 carbon atoms; 15 R 6 -O-R

7 -NH-R 8 -NH 2 (1ll) where R 6 is a hydrocarbon group having 1-40, preferably 8-32, carbon atoms, R 7 and Ra are an aliphatic hydrocarbon group or different aliphatic hydrocarbon groups having 2-4 carbon atoms; 20 R 13 -NH 2 (IV) where R 13 is a hydrocarbon group having 1-40, preferably 8-32, carbon atoms. 25 7. The use as claimed in one or more of claims 1 to 6, where R 6 , R 9 , R 1 , independently of one another, are an alkyl or alkenyl group having 8 to 18 carbon atoms.

8. The use as claimed in one or more of claims 1 to 7, where R 6 , R 9 , 30 R1 3 are 2-ethylhexyl, isononyl, isodecyl and isotridecyl and dodecyl radicals.

9. The use as claimed in one or more of claims 1 to 8, where A is an ethylene(-C 2 H 4 -) group, a propylene(-C 3 H 6 -) group or a butylene(-C 4 HB-) 35 group. Preferably, A is an ethylene group. WO 2011/088963 PCT/EP2011/000007 12

10. The use as claimed in one or more of claims 1 to 9, where B is an ethylene(-C 2 H 4 -) group, a propylene(-C 3 H 6 -) group or a butylene(-C 4 H 8 -) group. 5

11. The use as claimed in one or more of claims 1 to 10, wherein the sum of x, y and z gives an integer from 15 to 30.

12. The use as claimed in one or more of claims 1 to 11, where the 10 collector according to the invention is free from quaternary ammonium compounds that comprise at least one organic radical that is bound to the ammonium nitrogen atom, optionally contains heteroatoms, and has 8 to 36 carbon atoms. 15

13. The use as claimed in one or more of claims 1 to 12 for the flotation of silicate from iron ore in combination with another nitrogenous silicate collector at a pH of 7-12, where the other collector is selected from the group of alkyl ether amines, alkyl ether diamines, alkylamines, or quaternary ammonium salts. 20

14. The use as claimed in one or more of claims 1 to 13 for enrichment of iron ore.

15. The use as claimed in one or more of claims 1 to 14 in the flotation 25 of silicate from iron ore, calcite, phosphate ore and feldspar.

16. The use as claimed in one or more of claims 1 to 15 in the flotation of silicate, wherein the ore comprises between 0 and 90% of silicate. 30

17. The use of the flotation reagent as claimed in one or more of claims 1 to 16 in combination with frothers and depressants. WO 2011/088963 PCT/EP2011/000007 13

18. The use of the flotation reagent as claimed in one or more of claims 1 to 17 in a pH range from 7 to 12.

19. The use of the flotation reagent as claimed in one or more of claims 5 1 to 18 in amounts of 0.001 to 1.0 kg per tonne of crude ore.

20. A method for the reverse flotation of iron ore that comprises magnetite, hematite or both, by contacting the iron ore with a composition comprising 10 A) at least one amine alkoxylate ester of the formula (1) or a salt thereof (A-0~ R4 Ri---N B-,I N A--O R2 (1) --- R3 where A, B independently of one another are a C2 to C5 alkylene radical 15 R 1 is a C8 to C24 alkyl or alkenyl radical R 2 , R 3 , R 4 independently of one another are H or a C8 to C24 acyl radical, with the proviso that at least one of the radicals R 2 , R 3 or R 4 is a C8 to C24 acyl radical x, y, z independently of one another are an integer from 0 to 50, with 20 the proviso that x + y + z is an integer from 1 to 100, and B) a compound of the formula D-NH 2 , where D is a hydrocarbon radical 25 having 1 to 50 carbon atoms and which can contain either an oxygen atom or an oxygen atom and a nitrogen atom, in amounts of 10 to 5000 g/tonne of iron ore.